Crossword Clue:

to make a mutual promise of marriage

AnswerCrossword Clue
IDOSIt takes two to make a marriage
GUARANTYPromise to make good a loss.
BETROTHALMutual promise to marry
BETROTHTo promise in marriage
TROTH"To tell the .." (promise marriage?)
PAINFREEWhat some killers promise to make you?